Abstract
The matrix isolation technique has been employed in conjunction with infrared spectroscopy for the formation, isolation and characterization of the intermediate 1:1 complexes of pyridine with SiF 4 and GeF 4. A high yield of product was observed, at dilutions as high as 4000/1/1, in twin jet experiments. At the same time, no evidence was detected for the known 2:1 complex. The product complexes were characterized by intense absorptions due to the perturbed acid subunit; the magnitude of shift from free acid was indicative of the formation of a very strong complex. Numerous vibrational modes of the complexed pyridine were observed, with shifts comparable to those noted for pyridine in transition metal complexes. Shifts were, as in previous studies, greater for the GeF 4 complex than for the SiF 4 complex, confirming the greater acidity of GeF 4 relative to SiF 4.
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